Clock



FIG. 1 is a top plan view of a clock showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof. 

The ornamental design for a clock, as shown and described. 